Cylinder-reducer.



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No MODEL UNITED STATES PATENT OEEICE.

Patented August 1904.

JOHN N. PAULSON, OF SEATTLE, WASHINGTON.

CYLINDER-REDUCER.

SPECIFICATION forming part of Letters Patent No. 767,527', dated August16, 1904,

Application filed February ll, 1904. Serial No. 193,052. (No model.)

To all whom it may concern,.-

Beit known that I, JOHN N. PAULsoN, a citizen of the United States,residing at Seattle, King county, State of Washington, have inventedcertain new and useful Improvements in Cylinder-Reducers; and I herebydeclare the following to be a full, clear, and exact description of thesame.

My invention relates to reducers for cylinders, and while it isapplicable to any pistoncontaining cylinder which for any purpose mayrequire to have its capacity reduced it is especially useful inconnection with pumps, whether operated by steam, hand, or any otherkind of power.

My present invention is another form of that cylinder-reducer formingthe subjectmatter of a contemporaneous application, Serial No. 193,051,tiled February 11, 1904.

The object of my invention is to provide a simple and effective meansfor readily converting the pump from one for low duty to one for highduty, such conversion being particularly useful in the matter of testingsteamboilers for pressure.

In many situations, especially on shipboard, the pumps in use forfeeding the boilers are of such size that they are not available undertheir driving power, usually a donkey-boiler, for pumping against thehigh pressure required by the test, and other pumps, frequentlyhand-pumps, are brought down to the ship and after being connectedrequire a long time to get up the required pressure; but if the pumpsalready in place could be made to serve the purpose under the limitedpower of the donkey-boilers much saving in time and labor would result.By my invention such pumps can be used for this purpose by fitting theircylinders with reducers, thereby converting them to `high-duty pumps,the donkey-boilers or even hand-power being in their reduced conditionample to pump up to the test-pressure conveniently and quickly.

My invention consists in the novel reducer which I shall now describe byreference to the accompanying drawing, in which the iigure is alongitudinal vertical section of a pumpcylinder, showing the applicationof my reducer. f

A is a pump-cylinder. At one end the cylinder has a removable head a andat the other a stuffing-box a', through which passes the piston-rod O.

The reducer comprises two bushings or barrels, an inner one D and anouter one D, the two telescoping freely, being united and guided by thepins d3 in the one playing in slots CZ in the other. Openings CZ in thebushings near one end establish free communication with the cylinderspaces and ports. The inner end of the inner bushing D projects beyondthe inner end of the outer bushing and is-provided with a flange l, andthe inner end of the outer bushing has a'iiange d2. Between the twoflanges on the projecting end of the inner bushing is an expansion-ringE, which may consist of metal-as, for example, a split ringe-or it maybemade of elastic material, such as rubber, said ring in any case,whether of metal or rubber, being of a nature to expand its exteriordiameter under side compression between the two iianges CZ/ and (Z2. Theouter end of the outer bushing D terminates against the inner surface ofthe cylinder-head a; but the inner bushing projects through said headand is threaded to receive a screw-cap F.

The end of the piston-rod O, which originally had screwed upon it thelarger piston for the cylinder A, has now screwed upon it the substitutepiston c, secured by a nut c, and of a diameter to fit the innerreducerbushing, as shown.

To make the change from the larger to the smaller cylinder, theoperation is as follows: The ordinary head of the pump-cylinder is firstremoved, and the large piston, with its rod, is passed out through theopen end of the cylinder. The reducer D D is now inserted in thecylinder through its open end, the entrance being readily effected byreason of the expansion-ring E being normal-that is, under no sidepressure. The larger or origin al piston having been removed from therod O and the smaller piston c substituted, said rod is passed inthrough the inner bushing and through the stung-box until the smallerpiston c is seated in the inner bush'- Then the apertured head a isfitted over ing.

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the projecting end of the inner bushing and is bolted to the cylinder A.Finally the cap F is screwed on the outer end of the inner bushing' upto the head u. By tightening this cap against the head the inner bushingis drawn outwardly, which has the double er? feet through the inner endflange (TZ of' said bushing or' tightening' the outer end of the outerbushing against the inner surface of the head a and of compressinglaterally between the two flanges Z and Z2 the expansion-ring E, causingsaid ring to grip the walls ofl the cylinder A. Thus the reducer isfirmly held in place, and the pump may be operated for high-pressureduty.

The reducer may when the occasion for its use is past be readily removedand the pump thus restored to its original condition.

Having' thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

l. A reducer for pump and other piston cylinders, comprising telescopicbushings iitted within the cylinder, means for relatively moving' saidbushings with respect to each other, and a means operated by saidmovement to secure the bushings in the cylinder.

2. A reducer for pump and other piston cylinders, comprising telescopicbushings litted within the cylinder, means for relatively moving saidbushings with respect to each other, and means carried by the reducerand operated by said movement, `for gripping the cylinder-wall.

3. A reducer for pump and other piston cylinders, comprising telescopicbushings iitted within the cylinder, means for relatively moving saidbushings with respect to each other, an expansion-ring carried by thereducer, and flanges on the bushings on each side of' said ring' adaptedby their movement to press upon and effect' the expansion of the ring togrip the cylinder-wall.

el. A reducer for pump and other piston .cylinders comprising'telescopic bushings fitted within the cylinder, and relatively movablewith respect to each other, means for clamping said bushings to thecylinder-head, and means on said bushings dependent on the operation ofthe clamping means for gripping the cylinder-wall.

5. A reducer for pump and other piston cylinders, comprising telescopicbushings fitted within the cylinder, the inner bushing projectingthrough the cylinderhead, and the outer bushing' having' its end bearingagainst the inner surface ofl said head, a cap threaded upon theprojecting end of the inner bushing and adapted to be set up against theouter surface of said head, and means on the inner end of the reduceroperated by the relative movement of the two bushings effected bysetting up the cap, to grip the cylinder-wall.

6. A reducer for pump and other piston cylinders, comprising telescopicbushings fitted within the cylinder, the inner bushing projectingthrough the cylinder-head, and the outer bushing having its end bearingagainst the inner surface of' said head, a cap threaded upon theprojecting end of the inner bushing and adapted to be set up against theOuter surface ofl said head, a iiange on the inner end of' the innerbushing, a fiange on the inner end of the outer bushing and anexpansion-ring' between the two fianges adapted by compression to gripthe cylinder-wall.

In witness whereof 1 have hereunto set my hand.

JOHN N. PAULSON.

Vitnesses:

VALTER F. VANE, D. B. RICHARDS.

